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- Title
Growth and metal removal potential of a Phormidium bigranulatum-dominated mat following long-term exposure to elevated levels of copper.
- Authors
Kumar, Dhananjay; Gaur, J.
- Abstract
The present study explores the tolerance and metal removal response of a well-developed 2-week-old Phormidium mat after long-term exposure to Cu-enriched medium. Cu enrichment inhibited increase in mat biomass in a concentration-dependent manner. Mat area and the number of entrapped air bubbles decreased as Cu concentration increased in the medium. Decrease in number of air bubbles obviously reflects the adverse effect of Cu on photosynthetic performance of the mat. Metal enrichment did not substantially alter the amount of pigments, such as chlorophyll a, chlorophyll b, carotenoids, and phycocyanin, in the mat. Enhancement of Cu concentration in the medium led to changes in species composition of the test mat; however, Phormidium bigranulatum always remained the dominant organism. Relative share of green algae and some cyanobacterial taxa, namely, Lyngbya sp. and Oscillatoria tenuis, in the mat were increased by Cu enrichment. The mat successfully removed 80 to 94 % Cu from the growth medium containing 10 to 100 μM Cu. Extracellular polysaccharides, whose share increased in the mat community after metal addition, seem to have contributed substantially to metal binding by the mat biomass.
- Subjects
COPPER; PHORMIDIUM; METAL toxicology; BIOMASS; LYNGBYA; OSCILLATORIA; CHLOROPHYLL; CAROTENOIDS
- Publication
Environmental Science & Pollution Research, 2014, Vol 21, Issue 17, p10279
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-014-2920-x